[petsc-dev] PetscHashIJ scaling problem?

Matthew Knepley knepley at gmail.com
Mon Nov 11 16:12:26 CST 2013

On Mon, Nov 11, 2013 at 4:02 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> Matthew Knepley <knepley at gmail.com> writes:
> > I rewrote insertion for DMLabel to use the hash table, and convert to
> flat
> > arrays after insertion. Now its all linear:
> Nice.  Did you check how many hash operations per second this works out
> to?  Is this still the leading setup cost?

I did not check, but it would be interesting to check 3D since that it 4
part keys. It by far
the leading cost in mesh setup, but matrix preallocation is 3x more
expensive right now.


What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener
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